Turbo bypass valves (Forge Valve)

[Charlie Smith]

Earlier, josh Wyte wrote:
> 
> On the Audi's, the stock bypass valve actually holds
> together quite well.  
> 
> I replaced mine with a Forge and noticed no difference
> whatsoever.  So I took the Forge out (which didn't fit
> very well, btw) and put the stock one back in.  I have
> 60k trouble free miles on the stock one.
> 
> You can get a new stock one for $31, vs the $130+ that
> the aftermarket ones cost...

Yup, the stock bypass valve works fine.  But it doesn't always
last very long, I think particularily with high boost.  When you 
noticed no difference, that just means yours was still working OK.
At 60K miles, mine was not working OK.

I just called Forge, and found the differences in the 1.8T and the 2.7tt
versions.  First, I have the 1.8T version installed, and it fits fine on
my 1995 S6.

The valve for the 2.7tt is a bit more compact to fit that car.  The top
on the 1.8T model is held together with allen bolts, the top in the 
2.7tt model is threaded and screws together like a bottle cap so it 
is a bit smaller on the outside dimensions.  I didn't ask them about
the inner piston diamer of the two models, so I don't know if it's 
the same.

    - Charlie